"The majority of drug deaths in an Australian study, conducted by the National Alcohol and Drug Research Centre, involved heroin in combination with either alcohol (40 percent) or tranquilizers (30 percent)."
Source
Peele, Stanton, MD (1998), "The persistent, dangerous myth of heroin overdose," published in DPFT News (Drug Policy Forum of Texas), August, 1999, p. 5, from The Stanton Peele Addiction Website, last accessed Nov. 7, 2017.
http://www.peele.net/lib/hero…
